[retroforth] Re: factoring request
- From: "Helmar Wodtke" <helmwo@xxxxxx>
- To: retroforth@xxxxxxxxxxxxx
- Date: Tue, 26 Oct 2004 21:36:04 +0200
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retroforth@xxxxxxxxxxxxx schrieb am 26.10.04 21:25:17:
>
>
> >I expect words that are surrunded by round braces are to be words that are
> >used for an internal implementation only and that they should not be used
> >from outside. This interpretation comes from the ( ... )-comments: the
> >programmer says something like "Yes, you can see this word in dictionary,
> >but you can safely ignore this since I used this word for implementing some
> >strange internals for another word and you do not really need this."
> >
> >
> In this case, it is used for strange internals. It's not often that you
> should need to be able to create a word apart from the normal input
> stream. It's an advanced feature that can be abused in unique ways. :-)
>
> " a word" (create) here 5 - h0 ! ] words cr cr cr ;
> " a word" find execute
Of couse it can be used to do strange things.
But it's a needed word if you do want to implement something that decides on
input if the token that was read in is a new entity that needs to be
represented in dictionary. Foreward-references are always such a kind of thing.
The mechanism in question would decide by its own if it want to make a new
dictionary entry or not. In that case the mechanism needs the string from "32
parse" first to make any decition.
Bis dann,
Helmar
helmwo@xxxxxx
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